Set of headphones



FIG. 1 is a perspective view of a set of headphones as seen from the front and left side;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for set of headphones, substantially as shown and described. 